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/*************************************************************************
*
* HTCd - Copyright (C) 1998-2006 Henrik Rydberg
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <lang/env.h>
static dbmap* GetDB(Env& env) throw(merror_t) {
if(!env.db) THROW("htc: no open database");
return env.db;
}
static int eval(Env& env,expr_t* x,int mod=OP_ALL) {
mswrite out;
if(x->status&OP_PARSE) env.parse(out,x->expr); else x->eval(out,env,mod);
return atob(out.str());
}
////////////////////////////////////////////////////////////////////////////
TOK_IMPL(create) {
dbref_t* ref=DBRef(*env.toks,env[0],ms_empty,tok_t::PUBLIC,1);
ref->db.Open("/dev/zero",1);
sref first,rest=env[1]; int n=0;
while(Split(first,rest)) ref->db.InsertTable(n++,first);
ref->db.Order(env[2],env[3]);
}
TOK_IMPL(sort) {
dbref_t* ref=(dbref_t*)env.toks->get_this(env[0]);
if(env.is_clear(ref)&&ref->is_dbref()) {
ref->db.remap();
ref->db.Sort(env[1],env[2]);
}
else THROW("htc: "<<env[0]<<" is not a sortable on the current level");
}
TOK_IMPL(db) {
dbref_t* ref=(dbref_t*)env.toks->get(env[0]);
if(env.is_clear(ref)&&ref->is_dbref()) {
ref->db.remap();
Env(env,ref->db).parse(out,env.arg(1));
}
else THROW("htc: "<<env[0]<<" is not a db reference");
}
////////////////////////////////////////////////////////////////////////////
TOK_IMPL(query) {
dbmap* db=GetDB(env);
expr_t* x[2]={env.arg(0),env.arg(1)};
Env nenv(env,*db);
nenv.dbat=0;
while(nenv.dbat>=0&&env.req->is_running()&&nenv.dbat<db->size()) {
int size=db->size();
if(eval(nenv,x[0],OP_LOCAL)) nenv.parse(out,x[1]);
if(db->size()==size) nenv.dbat++;
}
}
TOK_IMPL(find_rec) {
dbmap* db=GetDB(env);
Env nenv(env,*db);
nenv.dbat=db->Find(env[0]);
if(nenv.dbat>=0&&nenv.dbat<db->size()) nenv.parse(out,env.arg(1));
else env.parg(out,2);
}
////////////////////////////////////////////////////////////////////
TOK_IMPL(first_rec) { env.dbat=0; }
TOK_IMPL(prev_rec) { if(env.dbat>0) env.dbat--; }
TOK_IMPL(next_rec) { if(env.dbat<GetDB(env)->size()) env.dbat++; }
TOK_IMPL(exist_rec) { out<<bool(env.dbat>=0&&env.dbat<GetDB(env)->size()); }
TOK_IMPL(rem_rec) {
dbmap* db=GetDB(env);
if(env.dbat>=0&&env.dbat<env.db->size()) db->Rem(env.dbat);
}
////////////////////////////////////////////////////////////////////
TOK_IMPL(lastkey) {
dbmap* db=GetDB(env);
if(!db->empty()) out<<db->at(db->size()-1,db->Index());
}
TOK_IMPL(prevkey) {
dbmap* db=GetDB(env);
if(env.dbat>0&&env.dbat<=db->size()) out<<db->at(env.dbat-1,db->Index());
}
TOK_IMPL(nextkey) {
dbmap* db=GetDB(env);
if(env.dbat>=0&&env.dbat+1<db->size()) out<<db->at(env.dbat+1,db->Index());
}
TOK_IMPL(qprevkey) {
dbmap* db=GetDB(env);
expr_t* x=env.arg(0);
Env nenv(env,*db);
nenv.dbat=env.dbat-1;
while(nenv.dbat>=0&&env.req->is_running()&&nenv.dbat<db->size()) {
if(eval(nenv,x,OP_LOCAL)) { out<<db->at(nenv.dbat,db->Index()); break; }
else nenv.dbat--;
}
}
TOK_IMPL(qnextkey) {
dbmap* db=GetDB(env);
expr_t* x=env.arg(0);
Env nenv(env,*db);
nenv.dbat=env.dbat+1;
while(nenv.dbat>=0&&env.req->is_running()&&nenv.dbat<db->size()) {
if(eval(nenv,x,OP_LOCAL)) { out<<db->at(nenv.dbat,db->Index()); break; }
else nenv.dbat++;
}
}
////////////////////////////////////////////////////////////////////
void envAddDB(tokmap& T)
{
TOK_ADD(create,"xxxx",tok_t::SYSONLY,
"%Create a new database\n"
"%Syntax: \\create{varname}{tables}{index}{comp}\n"
"%\n"
"%Index is the unique, ordered table.\n"
"%Comp is the compare function.\n"
"%A maxmimum of 32 tables are allowed in HDB/1.2\n"
);
TOK_ADD(sort,"xxx",tok_t::PRIVATE,
"%Sort a database\n"
"%Syntax: \\sort{varname}{index}{comp}\n"
"%\n"
"%Note that only globals on the current level are sortable.\n"
);
////////////////////////////////////////////////////////
TOK_ADD(db,"xr",tok_t::PRIVATE,
"%Set current database\n"
"%Syntax: \\db{varname}{body}\n"
"%\n"
"%Within body, all database functions apply.\n"
);
TOK_ADD(query,"xr",tok_t::PRIVATE,
"%Query current database\n"
"%Syntax: \\query{test}{body}\n"
"%\n"
"%Evaluates body for all record where test is true.\n"
"%\n"
"%optimizes globals; it is ok to use full function\n"
"%expressions in the query. Turned out to be better after all.\n"
);
TOK_ADD(find_rec,"xr?",tok_t::PRIVATE,
"%Find record by key, in current database\n"
"%Syntax: \\find.rec{key}{body}<else>\n"
"%\n"
"%Evaluates body if key is found in the current ordering.\n"
"%Otherwise, evaluates <else>, if exist.\n"
);
////////////////////////////////////////////////////////
TOK_ADD(first_rec,"",tok_t::PRIVATE,
"%Go to first record\n"
"%Syntax: \\first.rec\n"
);
TOK_ADD(exist_rec,"",tok_t::PRIVATE,
"%True if current record exist\n"
"%Syntax: \\exist.rec\n"
);
TOK_ADD(next_rec,"",tok_t::PRIVATE,
"%Go to next record\n"
"%Syntax: \\next.rec\n"
);
TOK_ADD(prev_rec,"",tok_t::PRIVATE,
"%Go to previous record\n"
"%Syntax: \\prev.rec\n"
);
TOK_ADD(rem_rec,"",tok_t::SYSONLY,
"%Remove current record\n"
"%Syntax: \\rem.rec\n"
);
////////////////////////////////////////////////////////
TOK_ADD(lastkey,"",tok_t::PRIVATE,
"%Last key of current order\n"
"%Syntax: \\lastkey\n"
"%\n"
"%Silently ignored if not found.\n"
);
TOK_ADD(prevkey,"",tok_t::PRIVATE,
"%Previous key of current order\n"
"%Syntax: \\prevkey\n"
"%\n"
"%Silently ignored if not found.\n"
);
TOK_ADD(nextkey,"",tok_t::PRIVATE,
"%Next key of current order\n"
"%Syntax: \\nextkey\n"
"%\n"
"%Silently ignored if not found.\n"
);
////////////////////////////////////////////////////////
TOK_ADD(qprevkey,"r",tok_t::PRIVATE,
"%Previous key of current order, satisfying query\n"
"%Syntax: \\qprevkey\n"
"%\n"
"%Silently ignored if not found.\n"
);
TOK_ADD(qnextkey,"r",tok_t::PRIVATE,
"%Next key of current order, satisfying query\n"
"%Syntax: \\qnextkey\n"
"%\n"
"%Silently ignored if not found.\n"
);
}
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